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BIS Certification for Valve Fittings for LPG Cylinders Above 5 Litres IS 8737:2017

Valve Fittings For Use With Liquefied Petroleum Gas Cylinders Of More Than 5 Litre Water Capacity Part 2 Valve Fittings For Newly Manufactured Lpg Cylinders

Valve fittings are the most critical components of LPG cylinders. They control the flow of gas, ensure safety during use, and prevent gas leaks or pressure-related accidents. In India, for LPG cylinders with a water capacity exceeding 5 litres, the Bureau of Indian Standards (BIS) mandates compliance with IS 8737:2017, a standard that ensures the performance, safety, and durability of valve fittings used in such cylinders.

This certification is not merely a regulatory formality—it is a necessary safety mechanism. LPG is a highly flammable fuel, and any failure in the valve system could result in serious fire hazards, explosions, or toxic exposure. Hence, the quality of valve fittings, particularly those used in high-pressure environments, is stringently regulated by BIS through this standard.

Importance of IS 8737:2017 for LPG Valve Fittings

IS 8737:2017 lays down the specifications for valve fittings used in LPG cylinders exceeding 5 litres of water capacity, commonly used in domestic, commercial, and industrial sectors. These valves are responsible for safe filling, storage, and regulated withdrawal of gas. The standard outlines all aspects of design and performance, right from the materials used, structural design, and valve stem threading, to pressure-bearing capabilities, durability, and resistance to corrosion and impact.

This ensures that the valves can endure high internal pressures, external physical impacts, long-term operational stress, and exposure to environmental conditions—all while maintaining leak-proof and safe performance throughout the cylinder’s service life.

Scope of IS 8737:2017

The IS 8737:2017 standard is comprehensive and applies to newly manufactured valves that are intended for installation on LPG cylinders. It encompasses:

● Design requirements include valve body, outlet configurations, and protective components like security caps or nuts

● Materials of construction, such as high-quality brass or stee,l with corrosion resistance

● Compatibility with different LPG cylinder neck threads

● Rubber and moulded parts for sealing and leak prevention

● Marking, labelling, and traceability requirements

● Functionality under repeated operation and high-pressure conditions

The standard is often used in conjunction with IS 3196, IS 4576, and other relevant codes to ensure a complete safety framework for LPG storage and distribution systems.

Why BIS Certification is Mandatory

According to the Gas Cylinders Rules and quality control orders issued by the Department for Promotion of Industry and Internal Trade (DPIIT), compliance with IS 8737:2017 and BIS certification is mandatory for all manufacturers and suppliers of LPG valve fittings in India.

The BIS ISI mark on a valve fitting confirms:

● The product conforms to Indian safety and quality standards

● It has passed all prescribed tests

● It has been manufactured in a BIS-approved facility with strict quality controls

Without this certification, the valve fitting cannot legally be marketed or used in LPG systems in India, especially by oil companies, government suppliers, or licensed LPG distributors.

Tests Conducted as per IS 8737:2017

To ensure complete reliability, IS 8737:2017 requires that valve fittings undergo a series of stringent mechanical, chemical, and performance tests. These are conducted in BIS-approved laboratories and include:

●Tensile Strength and Elongation Test: Determines the valve’s ability to withstand mechanical stress without permanent deformation.

● Impact Strength Test: Assesses the valve's resistance to mechanical shocks or accidental drops.

●Thread Accuracy Tests: Evaluates the screw threads on the valve stem and cylinder neck for proper engagement and leak-proof fitting.

● Valve Outlet Connection Tests: Ensures correct design and compatibility with common LPG appliances and connectors.

● Design Verification: Includes checks for dimensions, wall thickness, and the presence of components like security caps, nuts, and sealing rings.

● Load Test: Simulates weight and pressure applied during actual use.

● Permanent Set Test: Verifies the valve's ability to return to its original shape after stress.

● Rust-Proofness of Spring: Ensures internal springs are protected from corrosion due to moisture or gas exposure.

● Minimum Wall Thickness: Ensures structural integrity under pressure.

● Stress Corrosion Test: Evaluates valve materials for resistance to cracking under stress in corrosive environments.

● Hydrostatic and Pneumatic Tests: Confirm the valve’s leak-tightness under water and gas pressure, respectively.

● Cycle Test: Simulates repeated opening and closing to assess long-term durability.

These tests reflect real-world conditions and operational stresses to guarantee the safety of every valve approved under this standard.

BIS Certification Process

Manufacturers who wish to obtain BIS certification for valve fittings under IS 8737:2017 must go through the following steps:

Application Filing with BIS, including product and factory details.

Product Testing at a BIS-recognized laboratory.

Factory Audit to evaluate production infrastructure, quality management systems, and in-house testing capabilities.

Grant of BIS License after successful inspection and testing.

Use of the ISI Mark on certified valve fittings with an assigned license number.

Surveillance Audits and Renewal at regular intervals to maintain compliance.

The BIS license is only issued when the manufacturer demonstrates consistent adherence to quality control and traceability systems, along with passing the mandatory tests under IS 8737:2017.

To Know The Process in Detail, Please Visit:

BIS ISI Mark Certification for Domestic Manufactures
BIS ISI Mark Certification for Foreign Manufactures

Under BIS Registration Products ISI and CRS

BIS CRS Registration For IT Products List
BIS ISI Mark Certification For ISI Products List

Documents Required for BIS Certification

To apply for BIS certification, manufacturers need to submit the following documents:
●  Application form
●  Manufacturing process details
●  Quality control plan
●  Test reports from BIS-approved laboratories
●  Factory layout and equipment details
●  Proof of business registration
●  Product specifications and technical details
●  Declaration of conformity to Indian standards
Additionally, manufacturers may be required to provide proof of compliance with environmental and safety regulations, depending on the specific type of product being certified.

BIS ISI Mark Certification Costing And Timeline

Conclusion

Valve fittings for LPG cylinders above 5-litre capacity are vital for safe gas storage and distribution. Given the hazardous nature of LPG, these fittings must meet the highest standards of performance and reliability. IS 8737:2017, established by the Bureau of Indian Standards, provides a robust framework for ensuring safety, quality, and consistency in these components.

BIS certification under this standard is not optional—it is a regulatory requirement for any manufacturer or supplier intending to participate in India’s LPG ecosystem. It not only ensures compliance with legal norms but also builds confidence among consumers and government procurement agencies regarding the safety of their LPG infrastructure.